Annual report pursuant to Section 13 and 15(d)

Business (Details)

v3.19.1
Business (Details) - segment
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2018
Dec. 31, 2013
Jan. 31, 2013
Business Acquisition [Line Items]            
Number of operating segments 2 2 3 2    
AIA Purchase Agreement            
Business Acquisition [Line Items]            
Ownership percentage in subsidiary         94.00% 86.00%